381523 has 2 divisors, whose sum is σ = 381524. Its totient is φ = 381522.

The previous prime is 381509. The next prime is 381527. The reversal of 381523 is 325183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381523 - 2⁹ = 381011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381494 and 381503.

It is not a weakly prime, because it can be changed into another prime (381527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190761 + 190762.

It is an arithmetic number, because the mean of its divisors is an integer number (190762).

2³⁸¹⁵²³ is an apocalyptic number.

381523 is a deficient number, since it is larger than the sum of its proper divisors (1).

381523 is an equidigital number, since it uses as much as digits as its factorization.

381523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 381523 is about 617.6754811388. The cubic root of 381523 is about 72.5282014741.

Subtracting from 381523 its sum of digits (22), we obtain a triangular number (381501 = T₈₇₃).

The spelling of 381523 in words is "three hundred eighty-one thousand, five hundred twenty-three".